byerlein



Aug. 16, 193-2. A. A. BYERLEIN 1,872,115

PRESS Filed Nov. 5, 1931 E: stress in the assembly rods.

1 Patented Au 16, 1932 Ii UNITED STATES PATENT ion-Flea ARTHUR A.BYERIQEIN, or DETROIT, MICHIGAN, AssIoNOIt ooENERAI. mommy CORPORATION,OF HAMILTON, 01110, A CORPORATION or DELAWARE I rBEss Application medNovember 5, 1931. Serial NO; 573,125.

to assembly rods, and then filling the space 'between the separatedsections so as to main: tain a desired elongation of the assembly rods.x Other Objects and advantages of the invention will be apparent fromthe following description, the appended claims, andthe accompanyingdrawing, in whichi 1 Fig. 1 is a front elevation of a press show-' inghow the assembly rods are" properly so stressed orelongated,in'accordance with the present invention; a Fig. 2 is a section takenhorizontally on the line 2-2 of Eig. 1;

Fig. 3 shows detail views of the spacers, and

Fig. 4 is a detail sectional view of the raising jack. 1

Referring more particularly to the drawing by reference numerals, 10designates generally a drawing or stamping press adapted for workingsheet metal or the like.

shown, this press comprises superposed sections, namely, the arch 11,the Opposite uprights 12 and 13 andthe bed 14, each of which may beintegrally castor formed, these several sections being held rigidlytogether by means of four vertical assembly rods, designated 16, 17, 18and 19. These assembly rods extend through vertical holesprovided in theseveral sections, and theupper and lower ends threaded engagementwiththe rod ends.

The nuts 20 may be tightened by means of wrenches or similar tools, butsuch tools are not suited to produce a desired tension or ltn accordancewith prior practice. it has been the custom to stress or lengthentheassembly rods by heating'theni with a torch sons to cause theirelongation, after which the nuts are tightened L on up and the rodspermitted to cool. However,

of the rods are provided .with nuts 20 in the rods takes placewhere'theyhave been heated, and it has been found impossible to stretch theseveral rods uniformlythroughout theirlength forthis reason. There is agreater reduction in sectional area of the rods at when this isdone,.most of the elongation of the heated portions, and when theassembly is completed, there is no way of knowing if the tension on therods equals the safe working capacity'of the press. If the tension onthe rods does not equal the safe working capacity of the press the rodswill be stretched somewhat the first time the press is subjected to itsfull load, causing the'frame to open at its joints and causing framesway wlth resultant misalignment of the dies and shaft bearings.

In accordance with the present invention A I the assembly rodsare'uniformly and simultaneouslystressed ,to the desired degree, when therods are cold, and no unusual reduction in sectional area takes'place atany one point along the len hs of the rods. This stressing or elongatlonof the rods is accomplished by applying a known force so as to-separate"adjacent sections Of-the press after the nuts 20 have been tightenedwith a bar or spanner wrench. As a suitable means for. creating thisseparating forc a jack 21 is placed on the bolster plate 22, and.

a suitable filler block 23 is applied between the top of the jack andthe lower side Of the slide 24, with the slide arranged in an end ordeadcenter position. This jack, as shown in Fig. 4, may comprise a" basesection 26 and a movable top member '27 fitting therein and adapted tobe raised by turning in thebolts 28 sothat ends of the latter extendinto the chamber 29 provided between the base 26 and top 27. Chamber 29is filled with'oil or other suitable liquid, and as the screws 28 aremoved axially into the chamber, sufiicient displacement'of the liquidfilling means of the. jack takes place to create a desired upwardpressure on the slide 24 of the press,

and, of course, a downward pressure on the press bed.' The result isthat the arch 11 and the side frames 12 and 13, which are secured to thearchby means of boltconnections 30, are forced upwardlyend separated osignature.

from the bed 14, the assembly rods being simultaneously and uniformlystretched to a' desired degree sufiicient to produce a determined stressor elongation. The spaces between the frame sections 12 and 13 and thebed 141are-then filled by applying spacers 32 and 33 at each assemblyrod, location as shown in Fig.2, these spacers being sllpped into placeby moving them transversely with respect to the axis of the assemblyrods.

When the several spacers, which are preferably plates of steel or thelike, are in place, the force created by the hydraulic jack is relievedand the jack is removed, leaving the assembly rods stretched apredetermined amount and tensioned in accordance with the requirementsofthe safe working capacity of the press. The several assembly rods .arestretched uniformly throughout their length and there is no irregularityin reduction of cross-sectional area.

While the method herein described, and

the form of apparatus produced thereby constitute preferred embodimentsofthe inven-' tion, it is to be understood that the invention is notlimited to this precise method and formof apparatus, and that changesmay be made in either without departing from the scope of the inventionwhich is defined in the appended claims.

What is claimed is:

1. The method of stressing the assembly rods of a sectional presscomprising forcing adjacent sections apart with a force sufficient tocause the desired elongation. of the rods,

and filling the space thus obtained between the adjacent sections.

2. The method of stressing the assembly rods ofa sectioned'pr'esscomprising forcing ad acent sectlons apart. so as to simultaneously andsimilarly elongate all of the as 'semblyrods, and applying spacersbetween the separated sections so as to permanently maintain a desiredelongation ofthe rods.

J 3. The methodof stressing the assembly rods of a sectioned presscomprising jacking the upper portion of the press away from the lowerportion thereof so as to simultane- 56 ouslya-nd similarly elongate allof the assembly rods to the desired degree, and filling the spacesbetween the separated parts of 4. The method ing a predetermined'forcebetween the press bed and the crank shaft so'as to separate adjacentsections ofthe press, and applying spacers between the separatedsections.

In testimony ARTHUR A. BYERLEIN;

of stressing the assembly r rods .of a sectioned press comprisingexert-- whereof I hereto affix my

